CRE Pulmonary Function Testing & Interpretation 1

Question 1

What is the FEV1/FVC ratio threshold used by GOLD guidelines to diagnose airflow obstruction in adults?

Accepted Answer

Less than 0.70

Answer

A post-bronchodilator FEV1/FVC ratio below 0.70 confirms the presence of persistent airflow obstruction per GOLD guidelines.

Question 2

A patient's spirometry shows a reduced FEV1/FVC ratio with normal or elevated TLC. This pattern is most consistent with which type of lung disease?

Accepted Answer

Obstructive lung disease

Answer

Obstructive lung disease is characterized by a reduced FEV1/FVC ratio; TLC is normal or elevated due to air trapping and hyperinflation.

Question 3

Which spirometry measurement represents the volume of air forcefully exhaled during the first second of a maximal forced expiratory maneuver?

Accepted Answer

FEV1

Answer

FEV1 (Forced Expiratory Volume in 1 second) is the volume exhaled in the first second of a forced vital capacity maneuver and is the primary indicator of airflow obstruction.

Question 4

The diffusing capacity of the lung for carbon monoxide (DLCO) is reduced in which of the following conditions?

Accepted Answer

Emphysema

Answer

Emphysema destroys alveolar walls and capillary beds, reducing the surface area available for gas exchange, which significantly lowers DLCO.

Question 5

In restrictive lung disease, what change is observed in Total Lung Capacity (TLC)?

Accepted Answer

TLC is reduced below 80% predicted

Answer

Restrictive lung disease is defined by a reduced TLC (<80% predicted), reflecting decreased lung volumes caused by parenchymal, pleural, or neuromuscular disease.

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CRE Pulmonary Function Testing & Interpretation 1